JPH0619599Y2 - Doctor device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a blade that presses against a roll of a papermaking machine such as a press machine to remove dust adhering to the surface of a roll such as a press center roll or a top roll. The present invention relates to a doctor device in which a holder is held.

[Conventional technology]

Generally, in this type of device, various holders are proposed for the blade holder that holds the blade so that the optimum doctor ring can be obtained and various requirements can be met.
It is used a lot. For example, in the type that rotates around the axis of the doctor back body to hold the blade in pressure contact with the roll surface, it is difficult to make the blade contact even and it is difficult to deal with the distortion that occurs during operation, and the blade wears. If it is easy to wear and wear, the contact angle will change greatly and the doctor ring effect cannot be improved.

On the other hand, it is a type with little blade wear change, that is, it has the flexibility to absorb the strain of the doctor and evenly adjust the linear pressure to correct the blade contact defect due to the misalignment of the doctor or the strain generated during operation. In the type that deploys a telescopic tube in the holder, when the blade wears, the holder itself has a fulcrum, so there is a large angle change, so the doctor setting angle is expected to be safe and the doctor ring effect is sacrificed to some extent if safety is set. If the blade cannot be removed on the roll and the blade is swirled once, a phenomenon occurs in which the swath area rapidly spreads to the full width. Especially when scraps are generated, if the doctor's linear pressure is increased and the structure is highly flexible, the blade or holder plate will bend and the sharp edge of the blade will rise, creating a gap where foreign matter and There is a drawback that there is more dust around it and the blade is raised.
In addition, it is necessary to provide a backup that suppresses the flexibility that easily escapes when the doctor is shocked, and uneven wear occurs due to the biting phenomenon, which causes a problem that the doctoring effect cannot be fully exerted. In this way, since the tube type holder has a fulcrum such as the rotation axis of the holder itself, the angle change due to the wear of the doctor blade is large, and it is 3 ° to 8 ° compared to other types of doctors.
° Must be set at a low angle. Further, when the tube type is used at a high pressure, there is a problem that the flexible structure, which is also an advantage, tends to bite the paper for the purpose of peeling the paper from the roll.

Further, the cross-sectional shape of the tube changes due to the wear of the doctor blade, and the pressurizing pressure changes. Even with the same pressure on the tube, the doctor's linear pressure decreases, and the doctor's performance was not fully exhibited.

[Problems to be solved by the device]

Since there are merits and demerits in both of these conventional doctor devices, it is possible to install two sets of doctor devices in one roll and combine them in the machine, but it is necessary to operate each doctor blade separately. For that reason, the tube type holder has the advantage of being structurally easy to press and open the blade only with the holder part, but normally, the doctor center installation space of the press center roll and top roll of the paper machine Is very narrow and cannot afford to put two sets of doctor devices side by side. Therefore, if the doctor body (back) is a common double doctor device, the rotating shafts on both end surfaces of the doctor back are received by bearings, and the doctor body is rotated by the blade and holder as a whole to apply pressure to the blade, In the tube type holder, the rotation direction of the doctor bag must be fixed, but both types of doctor bags move in the same rotation direction, so the advantages of both types cannot be utilized and the attitude of the blade is not sufficient. There was a problem that the scraping ability was low and the doctoring effect could not be obtained.

The present invention is designed to easily remove these drawbacks of the prior art, and to provide a double doctor device with separate blade holders so that the blade that comes into contact with the roll first has a large angle and sufficient rigidity. It is possible to press the doctor blade to the roll with arbitrary pressure by installing a holder of the type that can be contacted and a tube type holder with flexibility for the blade that comes in contact later, and it can be used without problems even at large angles So the scraping ability is high,
Since the holder has sufficient rigidity, the attitude of the blade is stable, and the aim is to provide a doctor device that can obtain high doctor ring performance without applying excessive pressure, saving space and cost. Is.

[Means for Solving the Problems]

First doctor bag 1 with first blade holder 11
The rotating shafts 3 at both ends of the bearing 2 are supported by bearings 4, and the first doctor back 12 is connected to the air cylinder 15 via a lever 14 so as to be rotatable, and the second blade holder 1 is also provided.
A second doctor back 22 provided with 2 is rotatably supported on the rotary shaft 3 by a bearing portion 23, and a lever 24 fixed to the second doctor back 22 is provided with a turn buckle 25 around the rotary shaft 3. The rotational position is adjustable so that it can be adjusted.

[Action]

In the doctor device of the present invention, the first doctor back 12 and the second doctor back 22 are coaxially supported on the rotating shaft 3 supported by the bearing 4, and the first doctor back and the second doctor back 22 are moved in the axial direction by the sliding device 5. The back 12 holds the first blade 2 in the installation position, the air cylinder 15 passes the pressure lever 14, and the blade holder 11 firmly holds the blade 1 to press the roll surface R with a large angle and sufficient rigidity. The second blade 2 has the first
The blade 1 is pressed on the downstream side with a smaller contact angle and a smaller contact pressure than the first blade 1.

In the second blade 2, the second doctor back 22 is fixed in the rotational direction by a turnbuckle 25, and the air tube 27 installed in the second blade holder 21 is adjusted to support the spindle 2.
With a flexible structure that oscillates around 8, the distortion of the roll and the doctor that occurs during operation is absorbed, and the linear pressure of the doctor is automatically corrected to a uniform state over the entire width to keep the dust around the roll. It is possible to properly block and eliminate, and it is possible to operate with an auxiliary scrap removal function, that is, the first doctor back 12
The first doctor back 12 is driven by the air cylinder 15 connected to the air cylinder 15 so that the first doctor back 12 can rotate freely while being separated from the second doctor back 22 in the rotation direction. Since it can be pressed into contact with the blade holder 11 and can be used with no problem even with a large contact angle, the blade holder 11 has a high scraping ability and a sufficient rigidity can be imparted to the blade holder 1, so that the posture of the blade 1 is stable and no excessive pressure is applied. Even so, high doctor performance is obtained.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 3. Blades 1 and 2 which can be pressed against the roll surface R are attached to a doctor holder 1.
In the doctor device provided on the doctor backs 12 and 22 by holding the blade backs 1 and 21, a plurality of blade holders 11 and 21 that allow the blades 1 and 2 to have different contact angles and contact pressures on the roll surface R, respectively. It is a doctor device which is swingably provided by doctor backs 12 and 22.

In this case, a blade holder 11 having a first blade 1 and a blade holder 21 having a second blade 2 that can be individually operated at two locations on the upstream side and the downstream side of the rotation of the roll are provided in combination, A structure in which the first blade holder 11 is in a main force form having a large contact angle and a large contact pressure, and the second blade holder 21 functions in an auxiliary form having a small contact angle and a small contact pressure, respectively, to maintain a blade posture. It is better to use.

Further, a first doctor back 12 for fixing the first blade holder 11 is provided on the rotating shaft 3 so as to be integrally rotatable,
A second doctor back 22 having a second blade holder 21 is supported on the rotary shaft 3 by a bearing portion 23, and
The doctor back 12 is connected to the air cylinder 15 via a pressure lever 14, and the second doctor back 22 is a turn buckle 25 in which the rotation direction is fixed by a lever 24.
It is connected to the fixed portion 26 via a through hole so that the displacement can be adjusted.

The first blade 1 has a first blade as shown in FIG. 3A.
The doctor blade 12 is firmly held by the first blade holder 11 with the holding screw 16 and the fixing pin 18 having the holding piece 17 so that the roll surface R can be pressed tightly, and the fine adjustment screw 19 changes the temperature. However, the liquid sealing tube 31 is interposed between the holding piece 32 and the blade holder 21 as shown in FIG. 3C to have a firm holding force and stability, and is flexible. It is also possible to use a type of holder that has both.

Further, the second blade 2 has a support shaft 28 as shown in FIG. 3B.
The second blade holder 21 is fixed by a pin 30 on a finger 29 that is swingably provided by an air tube 27, that is, an open air tube or a pressurized air tube, which operates the finger 29 to move the attitude of the second blade 2. It is a type that can raise and lower.

The rotary shaft 3 is moved about 20 mm in the roll axial direction by a mechanism using air pressure, hydraulic pressure, or an electric motor to enhance the cutting effect of the doctor blade blade edge and to slide the slide device 5 for the purpose of protecting the roll. It is attached, but the bearing 4 of the doctor device is a system to receive two sets of doctor devices, one on each side of the machine, so that the advantages of space and cost saving of the double doctor can be achieved. It has become.

In the specific examples of FIGS. 4 and 5, a nozzle 6 capable of ejecting a very small amount of mist shower for the purpose of lubricating the second blade 2 is provided downstream of the first blade 1 and the shower is the first blade 1 It is designed to be ejected toward the lower surface of the. The shower water rinses away the paper material and foreign matter accumulated on the lower surface of the doctor blade, wets the roll surface, and is removed from the roll by the second blade 2.

The nozzle 6 may be jetted in one direction, but a nozzle that jets in two directions and simultaneously hits the vicinity of the second blade 2 may also be used.

It is considered that the shower water drops from the gap between the doctor bags 12 and 22 and is carried out of the paper machine.

[Effect of device]

According to the present invention, a first blade rotatably supports rotating shafts at both ends of a first doctor back held by a first blade holder and is rotatably connected by an air cylinder, and a second blade is a second blade. A second doctor bag held by a holder is rotatably supported by a bearing on a rotary shaft, and a fixed part and a turnbuckle are connected to adjust the rotational position around the rotary shaft. By arranging the blade vertically above and below the roll rotation direction, the firm holding force and stability of the blade are increased, and with excellent elasticity it is possible to meet various doctor ring conditions and the doctor blade can be used for any roll. Since it can be pressed with the pressure of, and it can be used at a large angle without any problems, it has a high scraping ability, and the holder has sufficient rigidity so that the blade posture is stable. In addition to being a space-saving, low-cost doctor device that can obtain high doctoring performance without applying more pressure than necessary, it also has the ability to automatically correct distortions that occur during operation, resulting in high responsiveness and real line pressure. Even if the temperature changes, the doctoring effect can be effectively exerted without affecting the performance, and the wear phenomenon can be effectively utilized, and continuous operation is possible without raising the doctor's linear pressure during operation, and the operating rate is also high. It has a practical effect such as a significant increase.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is a bottom view, and FIGS. 3A, B and C are partially cut side views of a blade holder, and FIGS. It is a side view of other examples. 1 ... First blade, 2 ... Second blade, 3 ... Rotating shaft, 4 ... Bearing, 5 ... Sliding device, 6 ... Nozzle, 1
1, 21 ... blade holder, 12, 22 ... doctor back, 14, 24 ... lever, 15 ... air cylinder, 23 ... bearing, 25 ... turn buckle, 26 ...
…Fixed part.

Claims (3)

[Scope of utility model registration request] 1. A rotary shaft 3 at both ends of a first doctor back 12 having a first blade holder 11 is supported by bearings 4, and the first doctor back 12 is connected to an air cylinder 15 via a lever 14 to rotate the same. The second doctor back 22 provided with the second blade holder 12 is rotatably supported by the bearing portion 23 on the rotary shaft 3 and the lever 24 fixed to the second doctor back 22 is made movable. A doctor device characterized in that a turnbuckle 25 is connected so as to adjust the rotational position around the rotary shaft 3. 2. The first blade 1 and the second blade 2
Are arranged on the upstream side and the downstream side in the rotation direction of the roll so as to be separated from each other, and the contact angle and the contact pressure of the first blade 1 located on the upstream side with respect to the roll surface R are set to the roll of the second blade 2. The doctor device according to claim 1, wherein a contact angle and a contact pressure with respect to the surface R are larger than the contact angle. 3. The first blade 1 and the second blade 2
2. A nozzle for injecting a mist shower for lubrication toward a roll surface R between and is provided.
Alternatively, the doctor device according to claim 2.